I'm not the best when it comes to wiring and speakers. So, in my GTI it has a stock 10 speaker system.

Front:
2x Tweeter
2x 4inch mid range
2x 8inch mid bass

Back:
2x Tweeter
2x 6.5inch mid range

If I wanted to get more overall loudness/sound quality. Is it possible for me to buy sets of speakers and replace the stock ones and wire them up with an amp? I'm not very good with this stuff, trying to learn.